Lock for swivel reflectors



Jan. 3, 1939. 5, RUSCH 2,142,458

I LOCK FOR SWIVEL REFLECTORS Fil ed May 8, 1955 029mm WW, mw h, QM

Patented Jan. 3, 1939 UNITED STATES PATENT OFFICE LOOK FOR SWIVEL REFLECTORS poration of Illinois Application May 8, 1935, Serial No. 20,331

1 Claim.

My invention relates to reflectors.

In certain types of reflectors in which the reflector has a threaded connection with respect to a supporting member, it is desirable that the screw threaded portion of the reflector should be screwed into the support as far as it will go in order to hold it securely. This may bring the reflector into an improper position, particularly if the reflector is of the angle type for giving a lateral direction to the light If the screwthreaded ring is unitary with the reflector and the reflector is in an improper position when the ring is screwed completely home, it would be necessary to thereafter turn the reflector to the del-r sired position, thus loosening up the threaded connection and subjecting the reflector to the liability of jarring loose and falling out.

One of the objects of my invention is to provide a construction which will enable the screwi0 threaded ring to be screwed completely in and to enable the reflector thereafter to be turned to the desired position without disturbing the screw-threaded connection.

A further object of my invention is to provide 25 means for locking the reflector in the desired adjusted position.

Further objects and advantages of the invention will be apparent from the specification and claim.

30 In the drawing, in which my invention is illustrated,

Figure l is a side elevational View of a reflector construction embodying my invention;

Fig. 2 is an axial section of the upper portion 35 of the reflector; and

Fig. 3 is a detail sectional view on the line 3-3 of Fig. 2.

Referring to the drawing in detail, the construction shown comprises a reflector supporting all member 2 having an internally threaded annular skirt portion, an angle type reflector 3 having a tubular neck portion 4 provided with an inwardly extending annular flange 5 on its upper portion, a screw-threaded ring 5 having a swivel connection with this annular flange 5 and designed to be screwed into the skirt portion 2 of the reflector supporting member, and clamping means i for locking the reflector against swiveling movement with respect to the screw-threaded ring 5 when 50 the reflector has been adjusted to the desired position.

For supporting a lamp in proper position with respect to the reflector 3, a lamp socket B is provided having the usual lamp contacts and secured 55 to the reflector supporting member by means of a pair of screws 9 extending through the insulating base of the lamp socket and threaded into lugs Ii secured to or forming part of the reflector supporting member.

The reflector supporting member is shown as of cast metal, although any suitable material may be used. It is shown as provided with a screw-threaded portion II for connection with a supporting conduit I2 and as having a passage 53 for the feed wires leading to the wiring ter- 0 minals on the socket.

The swivel ring is shown as formed of sheet metal having its lower portion spun or beaded over the inwardly-extending annular flange on the neck portion of the reflector, as shown at [4 to provide a swivel connection. A suitable gasket !5 may be provided between the flange 5 on the reflector neck and the spun-over portion [4 of the swivel ring in order to effect a proper connection and to give the desired resistance to swiveling. It has been found that this gasket may be omitted without seriously impairing the operation.

The locking means for holding the reflector against swiveling movement when in adjusted position comprises a clamping member l6 which may be of stamped sheet metal having a clamping jaw ll shaped to fit over the inwardly-extending bead M on the lower end of the threaded swiveled ring, having a foot portion 18 for bearing against the inside of the neck portion of the reflector and having a screw-threaded connection with a clamping screw l9 which extends through the neck of the reflector, leaving the screw head outside of the neck for convenience of operation. Washer members 20 of fibre, or other suitable material, may be provided between the foot portion of the clamping member and the reflectorneck and between the head of the clamping screw and the reflector neck.

In use, the threaded ring 6 of the reflector is screwed into the supporting member in the usual manner, the swivel connection between the screwthreaded ring 6 and the neck of the reflector being tight enough so that rotation of the refiector member will cause the swivel ring to be screwed tightly into position.

After the screw-threaded ring has been screwed in as far as it will go, the reflector may then be forced into the desired position of swivel adjustment by forcing it to swivel with respect to the screw-threaded ring. When the reflector has been thus forced to the proper position, it may be securely held in this adjusted position by tightening up the clamping screw l9 to clamp the lower portion of the swivel ring 6 tightly between the clamping jaw I1 and the edge of the inwardly extending flange 5 on the reflector neck.

In order to insure that there shall be no slippage between the reflector member and the swiveled ring when the reflector is being installed, the clamping screw I9 may be tightened up before shipping it. If this is done, no swiveling can take place between the reflector member and ring 6 in screwing the reflector into the supporting member I. When the swiveled ring has been screwed completely in, the clamping screw I 9 may be loosened up to permit the proper adjustment of the reflector and thereafter again tightened up to hold the reflector in the desiredadjusted position.

Further modifications will be apparent to those skilled in the art and it is desired, therefore, that the invention be limited only by the prior art and the scope of the appended claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: A device of the character described comprising an internally threaded support having an annular shoulder, a reflector-supporting ring adapted to be'threaded into said support snugly against",

said shoulder, said ring having an annular groove adjacent its outer end, a reflector having a tubular neck portion provided with an annular flange extending into said groove for rotation therein, and releasable means for locking said ring and said flange together against relative rotation, said means comprising a plate normally engaging the inner surface of said ring and the inner surface of said neck portion, and means accessible from outside said neck portion for clamping said plate to lock said ring and said reflector against relative rotation.

DAVID RUSCH. 

